Visual Test Shell for BACnet SVN

Changed parsing to handle new IFDEF type statements, CHECK and MAKE statements.
Altered pointers in sequencing packets after syntax check.

Now supports execution of new derived ScriptPacket, CHECK and MAKE type
commands. Changes here cover most of the ProcessTask method, NextPacket.

Added keywords for YES/NO, MAKE, CHECK, IF and related.

Changed ScriptPacket to derive from ScriptCommand and included a pointer
back to the previous ScriptCommand for MAKE purposes.

no message

Moved the queue handler's code to ScriptExecutor and made the queue
header only contain the class definition. This was necessary to include
the queue class somewhere else (for processing off the queue MAKE and
CHECK dialog commands).

Dialog class for displaying MAKE and CHECK dialogs.

Derived class for new message type the main app window processes to handle
MAKE type dialog creation and destruction.

Class for handling script parsing as it relates to IFDEF type processing.

Base class for main AFX app to process Script messages off the message queue.
Messages of this class are sent to the main app by the Script thread to handle
UI items among other things.